Microstructure and Mechanical Properties of Semi-Solid Die-Cast A356 Aluminum Alloy


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The present work deals with the relationship between microstructure and mechanical properties of A356 aluminum alloy which was produced via thixocasting process under different casting conditions. Feedstock billets were heated to a target temperature to obtain a semi-solid slurry with the required solid fraction. Some billets were heated to a fully-melted condition. In order to obtain fine and spheroidized Al grains, some billets for the partially melting were compressed axially by 33% at a room temperature before heating. The completely-melted and partially-melted slurries were die-cast by using a die-cast machine, and hour glass-shaped rod-type tensile specimens and small-size plate-type tensile specimens were obtained. Small cubic specimens were also collected from the die-cast products for microstructural evaluation. They were polished, and etched by Weck’s reagent. The partially-melted specimen which was compressed before heating shows the spherical Al grains. But the grain of the strain-free partially-melted specimen exhibited complicated morphology. The fully-melted specimen shows the fine and dendrite structure.



Edited by:

Qing Liu, Jian-Feng Nie, Robert Sanders, Zhihong Jia and Lingfei Cao




S. M. Lei et al., "Microstructure and Mechanical Properties of Semi-Solid Die-Cast A356 Aluminum Alloy", Materials Science Forum, Vol. 877, pp. 39-44, 2017

Online since:

November 2016




* - Corresponding Author

[1] M.C. Flemings, Behavior of metal alloys in the semisolid state, Metall. Trans. A, 22A 957-981.

[2] S.L. Lü,S.S. Wu,C. Lin Z.Q. Hu,P. An, Preparation and rheocasting of semisolid slurry of 5083 Al alloy with indirect ultrasonic vibration process, Mater. Sci. Eng. A, 528 (2011) 8635-8640.

DOI: https://doi.org/10.1016/j.msea.2011.08.014

[3] I.G. Chung, A. Bolouri, C.G. Kang, A study on semisolid processing of A356 aluminum alloy through vacuum-assisted electromagnetic stirring, Int. J. Adv. Manuf. Technol., 58 (2012) 237-245.

DOI: https://doi.org/10.1007/s00170-011-3376-5

[4] A. Bolouri,M. Shahmiri C.G. Kang, Coarsening of equiaxed microstructure in the semisolid state of aluminum 7075 alloy through SIMA processing, J. Mater. Sci., 47 (2012) 3544-3553.

DOI: https://doi.org/10.1007/s10853-011-6200-6

[5] Y. Birol, Thixoforming of EN AW-2014 alloy at high solid fraction, J. Mater. Proc. Technol., 211 (2011) 1749-1756.

DOI: https://doi.org/10.1016/j.jmatprotec.2011.05.016

[6] G.H. Yan S.D. Zhao S.Q. Ma, H.G. Shou Microstructural evolution of A356. 2 alloy prepared by the SIMA process, Mater. Charact., 6 9 (2012) 45-51.

[7] H.V. Atkinson, K. Burke, G. Vaneetveld, Recrystallisation in the semi-solid state in 7075 aluminium alloy, Mater, Sci, Eng, A, 490 (2008) 266-276.

DOI: https://doi.org/10.1016/j.msea.2008.01.057

[8] Weck E, Leistner E (1986) Metallographic instructions for colour etching by immersion, part iii: non-ferrous metals, cemented carbides and ferrous metals, nickel-base and cobalt-base alloys. DVS GmbH, Düsseldorf.

[9] Suárez-Peña B, Asensio-Lozano J, Vander-Voort GF (2010) Rev Metal (in Spanish) 46: 469.